<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        .big{
            margin: 50px auto;
            width: 700px;
            height: 600px;
            box-shadow:  10px 10px 10px 10px #ccc ;
            box-shadow:  10px 10px 10px 10px #ccc ;
            border-radius: 20px;
            margin: 50px auto;
            padding-top: 100px;
        }
        .box {
            width: 500px;
            height: 500px;
            border-radius: 50%;
            margin:auto;
             
            background: linear-gradient(135deg, #001aff, #001aff, #0c1140);
        }
    </style>
</head>

<body>
    <div class="big">
        <div class="box">

        </div>
    </div>

</body>

</html>